How many inches are in one millimeter?

One millimeter equals 0.03937 inches. Multiply any millimeter value by 0.03937008 to get inches.

What is 10 millimeters in inches?

10 millimeters equal 0.393701 inches (10 × 0.03937).

Is the millimeter to inch conversion exact?

The conversion factor used here (0.0393700787) is based on the internationally agreed definitions of both units, so results are exact up to rounding of the final decimal places.

Is my data stored when I use this converter?

No. The conversion runs entirely in your browser with JavaScript — nothing you type is sent to a server, logged or stored.

Millimeter to Inch Converter (mm to in)

Type a value above and it converts instantly — no button to press, no page reload, and the math runs entirely in your browser.

Quick answer: one millimeter equals 0.03937 inches. So to convert millimeters to inches, multiply by 0.03937008.

How to convert millimeters to inches

inches = millimeters × 0.0393700787

The millimeter is one thousandth of a meter and the workhorse of precision measurement — engineering drawings, 3D printing tolerances and rainfall totals are all quoted in millimeters.

The inch has been defined as exactly 2.54 centimeters since 1959. Screen sizes worldwide are still quoted in inches, making it one of the most-converted units on the internet.

Millimeter to Inch conversion table

Millimeter (mm)	Inch (in)
0.01 mm	0.0003937 in
0.1 mm	0.003937 in
0.25 mm	0.009843 in
0.4 mm	0.015748 in
0.75 mm	0.029528 in
1.25 mm	0.049213 in
1.75 mm	0.068898 in
2.5 mm	0.098425 in
3.5 mm	0.137795 in
4.5 mm	0.177165 in
6 mm	0.23622 in
8 mm	0.314961 in
10 mm	0.393701 in
12 mm	0.472441 in
14 mm	0.551181 in
16 mm	0.629921 in
18 mm	0.708661 in
20 mm	0.787402 in
24 mm	0.944882 in
26 mm	1.0236 in
30 mm	1.1811 in
35 mm	1.378 in
45 mm	1.7717 in
55 mm	2.1654 in
65 mm	2.5591 in
75 mm	2.9528 in
85 mm	3.3465 in
95 mm	3.7402 in
110 mm	4.3307 in
125 mm	4.9213 in
175 mm	6.8898 in
250 mm	9.8425 in
350 mm	13.7795 in
450 mm	17.7165 in
600 mm	23.622 in
750 mm	29.5276 in
900 mm	35.4331 in
1,500 mm	59.0551 in
2,500 mm	98.4252 in
10,000 mm	393.7008 in

Need the opposite direction? Use the Inch to Millimeter converter, or read our complete guide to length conversions for every formula in one place.

How to convert millimeters to inches

Millimeter to Inch conversion table

Frequently asked questions